ElsevierRodríguez Abad, I.; Martínez Sala, RM.; Díez Barra, R.; Capuz Lladró, R. (2013
AbstractIn the realm of architecture Ground-penetrating radar has been used as nondestructive technique to assess physical properties of wood structures in situ. However, a better understanding of the dielectric anisotropy of timber is needed to develop this application. An experiment was conducted on samples of sawn timber of different species (densities) to study their dielectric responses according to the grain directions using a GPR with a 1,6 GHz antenna. Interesting differences were found: the propagation velocities, as well as the amplitudes of the direct and reflected waves always presented lesser when the electric field was longitudinal to the grain than when transverse. But when the field was propagated in whatever transverse direction some of those parameters not differ greatly.
Estudio de la variación del contenido de humedad en el Pinus pinaster Ait por medio de la técnica no destructiva del georradar Assessment of the variation of the moisture content in the Pinus pinaster Ait using the non destructive gpr technique
Stem straightness was analyzed in six Spanish provenances of Pinus pinaster Ait.. Three methods were used: subjective punctuation by three different observers, type of curvature and “equivalent curvature” method (based on curvature dimensions). Straightness was evaluated in provenance test at two different sites, with 22 and 35 year-old trees respectively. Stem straightness was considered at three different heights, with the basal section showing the largest and more frequent curvatures. Results with the three methods are very similar in as far as the classification of the six provenances, although they differ in the time required and the information obtained. Large differences in stem straightness have been detected in the studied provenances.
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